Re: PRV oil distribution problems

["Steve Abbott" <abbotts@xxxx>]

The heads of later renditions of the Volvo version of the V6 
incorporated a cast "well" which held a pool of oil for the cam lobes 
to dip into. I believe even the later CIS (K-Jet) engines had this 
modification. Earlier versions relied solely on whatever oil squirted 
out from the cam bearings. Dopey. Another source of poor oiling to 
the valve gear came from worn timing chains and guides/tensioners. 
When the plunger on the hydraulic tensioners emerge far enough they 
uncover a hole in them which allows oil destined for the valve train 
to leak away straight back into the oil pan. Silly idea with no 
apparent purpose. And, as I've mentioned prior, I'm highly suspicious 
about the quality of the oil pump relief valve springs in the early 
engines. Not to mention these engines' tendancy for oil sludging. I 
scraped a pile of goo a good inch and half thick out the oil pan of 
mine. Sludge in the oil passageways tends to restrict oil movement, 
so resulting in even less oil to the valve train. Use good oil, 
change it frequently. I know the insides of my engine are spotless so 
I'll be using an engine cleaner/flusher compound every so often from 
now on. Not a good idea with old, sludgy engines though. The flusher 
will loosen the crud in the oil pan which will then block the oil 
pickup screen and starve the engine of oil. Bad.

Cheers
Steve Abbott 


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
wrote:
> Some people claim Volvo "fixed" reported oil passage problems with
> B28, but one of my factory manuals covering both blocks -- which 
goes
> into great detail of differences in pistons, valves, and camshafts -
-
> makes no mention of any difference in engine oiling system. I think
> passages are the same. I also think many people who experience
> lubrication problems simply failed to change their oil regularly.
> 
> Was recent discussion in another DeLo Group about oil changes. Some
> owners felt 7 quart capacity enabled longer than normal interval
> between changes. Others felt oil changes were only mileage 
dependent,
> not age dependent (can leave oil in sparsely driven car for years). 
I
> strongly disagree about both. Old oil, or heavily used oil, does not
> flow well, can become "clumpy", and is reportedly acidic. Not only 
is
> an oil change one of the cheapest and easiest procedures to perform,
> but I think is key to engine longevity.
> 
> My change interval on all cars is 2,500 miles BTW. Have none logging
> less than that at least every 9 months, so I don't worry about
> seasonal oil changes.
> 
> Am indeed very happy with my French PRV, but don't think Swedish
> rendition is as bad as that Brickboard quote made it seem. You'll
> notice on those Volvo bulletin boards that owners either love 
B27/B28
> and get hundreds of thousands of miles from them, or hate them and
> lament the day they bought a 60 series (no one noncommittal in the
> middle). I suspect difference is as simple as routine maintenance...
> 
> Bill Robertson
> #5939
> 
> >--- In dmcnews@xxxxxxxxxxxxxxx, rbrogren@xxxx wrote:
> > Volvo ended up screwing the oil system and therefore the Volvo PRV
> V6 which 
> > can be found in the DeLorean (it has a Renault transmission 
however)
> is not 
> > exactly the most durable thing around. How about the French 
versions
> then? They 
> > are the B20's of V6 engines, the blocks are virtually 
indestructible
> ( quarter 
> > million miles is no big deal for these, mine is approaching this
> mark ) and 
> > pack a quite nice punch. At 2.7L size, the Renault generates 144hp
> with K-Jet 
> > FI and Peugeot is right there with them. Not bad for something
> designed in the 
> > 70's.
> > 
> > Okay, so the HP ratings don't vary that much, but the diffrences 
in 
> > reliability are dramatical. True, similarities exists too, and
> costly repairs are just 
> > that. When this puppy blows it'll be the simplest choice to drive 
it
> off a 
> > bridge or something, also for the reason that anything that says
> 'Jaeger made in 
> > France' should be gutted out and thrown into the lake.
> > 
> > Allrightey.. all done with venting, thank you for all of those who
> managed to 
> > read all the way down here. Now hopefully you remember in the 
future
> that 
> > it's the Volvo PRV that has the reliability problems, not it's 
french 
> > counterparts.
> > 
> > 
> > -Matti Ronkko,
> > Finland
> > 
> > 
> > [Non-text portions of this message have been removed]